1. #1
    Just a heads-up on some ballscrews which are so good I can't help but share the link...

    Take a look here on ebay...

    Brand new THK precision-class ground, 32 diameter 10 mm pitch, long pre-loaded nut... 300 mm usable travel or a smidge over. The details don't seem to be in the current THK catalogue but going by the model code on the packaging, they seem to be a slightly 'custom' version of the EIK model listed in this catalogue in German (page 108):


    The end machining is a bit short for standard BK25 blocks but I think by removing one seal (and making other arrangements to keep crap out) it'll work...

    I ordered one and when it came ordered two more. They come in the original THK boxes with an inspection certificate. Lovely smooth, tight action when turning by hand. For £71.50 inc postage each it's a steal...

    I have no connection with the seller except as a happy customer. He says he has plenty of them - they were spares for a now discontinued motion platform (he has two of those too if anyone wants one - hexapod mill maybe?):

    Click image for larger version. 

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  2. #2
    Whats the preload class on these?
    Machine tools and 3D printing supplies. Expanding constantly.

  3. #3
    Not entirely sure. The feel is of a sort of light/medium preload I'd say - tight but not notchy at all. The PDF I linked to above says (in the table on p. 108) that the preload (Vorspannung) is 1.3 kN - but I'm not sure how that is measured. P. 49 says the preload is achieved through pitch offset of the different races within the single nut.
    Last edited by bikepete; 19-04-2016 at 01:23 PM.

  4. #4
    In case it helps the entire model number code is:


    and the one I have in front of me has serial number KX04K05797 - that is also the only thing etched onto the ballnut itself.

    Mmm, just found more in another THK catalogue (p. 15-248):

    S is presumably 'Special'
    6 is six ball circuits
    RR is labyrinth seals both ends
    G0 is "zero or less" axial clearance i.e preload
    535.5L is threaded length
    C5 is accuracy class
    Last edited by bikepete; 19-04-2016 at 01:46 PM.

  5. #5
    Very nice indeed! I keep having to remind myself to stop drooling over things like this for a while . After all I am having a clearout.
    Machine tools and 3D printing supplies. Expanding constantly.

  6. #6
    so 6 of these and i will feel exactly like this guy on the video

    /just before my wife comes home and throws me out/
    project 1 , 2, Dust Shoe ...

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